David lancaster dwinnell



(No Model.)I l

D. L. DWINNELL. HOT WATER BOILBR.

N0.443,432. Patentednec. 23,1890.

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UNITED v SrAAtnsv PATENT rricn.

DAviD LANCASTER .DWINNELD or MONTREAL, QUEBEC, CANADA, ASSIGNCR or CNE-HALF rro MILLER-'BRAS a TOMS, or SAME PLACE.

HOT-WATER BCILER.

SPECEICATION forming part of Letters Patent No. 413,432, dated December 23, 1890.

Application filed September 1890. Serial No. 363,982. (No model.)

To all whom it may concern:

Be it known that I, DAVID LANCASTER DWINNELL, ot' the city of Montreal, in the district of Montreal and Province ot Quebec,

5 Cana-da, have invented certain new and useful Improvements in Ilot/vaterBoilers; and I do hereby declare that the following is a iull, clear, and exact description of the same. This invention relates to that class of boilers lo or heating-furnaces generally used in connection with a system of hot-water pipes and coils, or pipes and radiators, used for warming buildings, and has for its object simplicity and cheapness in construction, to- I 5 getherwithamore rapid heating of the water.

The improvement consists in the combination, with the fire-chamber anda waterjacket surrounding same and communicating with the supply and return pipes, of waterzo sections iu the form of hollow disks or chambers having central apertured hub portions through which the water enters, central diaphragms which spread the Water outward or radially from the center of the sides and tire- 2 5 rines, such hub portion being of greater depth than the outer edges or peripheries of the disk, so as to secure tapering sides, and the whole being held together by a stay passing centrally through the uppermost sections and 3o having one end secured within the lowerniost section and the other end to the uppermost section. For full comprehension, however, of the invention reference must be had to the accompanying drawings, forming part of this 3 5 specification, in which like symbols indicate corresponding parts, and wherein- Figure l is a part vertical elevation and section of my improved boleror furnace; and Fig. 2, a complete vertical section ot' same,

4o taken centrally from front to back, 3 and 4 being horizontal sections respectively on lines :c no and .e e, Fig. l.

A is the base section of the furnace, and B the fire-ch amber section having water-jacket B', which are of the usual construction. On

top of the water-j acket B the lowermost watersection C is iitted, so that openings c c in its bottom side will communicate with similar openings, as h, in the top'of the water-jacket,

and upon this section C are built np any de- 5o Sired number ot intermediate sections C C C', which are finally capped by a head section C2, forming the top of the boiler. These several sections C, C', and C2 are each in the form ot hollow disks or chambers, the intermediate ones C taperingon both sides from central hub portions D D to their peripheries, while the lowermost and head sections C C2 have, respectively, only their upper and lower sides tapering from hub portions D D2, 6o their respective bottom and top sides being tlat and devoid of such hub portions.

Com municating opening d, d', and d'2 are respectively formed in the hub portions D, D', D, and D2, and the intermediate sections C are further provided with diaphrag1nsE,car ried centrally by web-supports e e, extending from the hub portions D D to them. These diaphragms E are of greater diameter than the openings d, d', and cl2 and eXtend about 7o halfway to the peripheries of the sections, so as to partially divide them into upper and lower halves, and thus compel the water entering through the lower openings to travel radially in the lower halt' from the center to- 75 Ward the peripheries and back in the upper half toward the upper central opening.

Flues F F for the products ot combustion are respectively formed in the lowermost section C and each of the intermediate ones C C', 8o and the several sections are so placed with relation to each other that such lines will alternate in position,.in order to secure zigzag passages for such products of combustion, a single flue F2 being provided in the top section 85 C2, which communicates with the usual pipe. The water-sections are `inclosed by a shell G, and the whole held together by means of a stay H, having one end screwed into a frog H (which bears on the under side of the hub 9o portion D of the lowerrnost section,) and eX- tending centrally up through the several diaphragms E, pierced for it, and through the top of the head-section C2110 receive a cap-nut H2, the lowermost section C being secured to the fire-chamber section B by means of bolts b2 passing through section C and tapped into section B. K is. the opening where the re turnpipes eettuhtlnieate with the waterl jacket at its lowest point, and L L the flow pipes leading out of the head-section C?, all of which are arrangtal as usual and require no special mention.

It will be apparent to those thoroughly aequainted with the nature of hot-water heating that spreading the volume of water into coniparatively thin sheets ot Very large area over highly-heated surfaces, as is the case with the sections shown, must quicken to a considerable extent the heating of the water, especially when the areas of the sheets of. waterare no more than that ot the inlet and outlet, and it will be further noticed that the tapering form of the sections provides a course ot travel quite in keeping with the natural inclination of hot water to rise, and, i'urthermore, facilitates cleaning operations.

The operation ot the boiler is the entering 1 of the water into the jacket ll', the rise ot same through the openings Z) and c to section ,l C, and the progress through the intermediate i sections C C to the head-section C?, whence f it proceeds by the flow-pipes L l).

That I claim is as Vfollows-- l. In a hot-water boiler or furnace, waterg sections in the form of hollow disks or chambers set horizontally, tapering from their cenl ter outward, having ilues for the passage of products of combustion, apertured hub portions forniing the point of contact between theseetions,audcentraldiaphragins,thewhole adapted to secure an inclined centrit'ugaland centripetal passage ot' the water upward.

In a hot-water boiler or furnace, the combination7 with the fire-chamber and a water-jacket surrounding same and commuA nicating with the supply or return pipes, oi water-sections in the i'orin of hollow disks or chambers in coinnuinication with said waterjacket and having tlues for the passage ol` products ot combustion, central apertured hub portions of greater depth than the outer edges or peripheries of such disks or charnbers and forming the point of contact between each section and securing tapering sides for same, one or more of such sections having a central diaphragm adapted to compel the passage et the water radially from the center of l such section or sections to its or their sides or peripheries, flow-pipes leading from the uppermost ot' such sections, a suitable shell or casing encircling such sections, a stay passing centrally through the uppermost sections and haring one end secured within the lowerinost section and the other end tothe upperimost section, and means for securing said :l lowerinostl section to the tire-chamber section,

as set forth.

Montreal, the 25th day ol' August, 130i).

lMl'lll IAXCAS'IER llll'lNNllllh. llitnesses:

FRED J. Scans, XVILL. l. Mclfm'r. 

